52 MacFarland Preliminary Account of Dorididse. 



series of 5 to 7 denticles decreasing in size from above downward ; in the 

 most anterior teeth of the radula the denticles occasionally number 10 or 

 11, the lowermost 4 or 5 being extremely small. The remaining 5 or 6 

 pleurae are small and of nearly the same size, obliquely placed, upper 

 margin prolonged into a slightly compressed blunt hook with a thin keel- 

 like plate extending from its posterior median line to base, general shape 

 being somewhat similar to first plural tooth. Total length of average first 

 pleural tooth .370 mm., of the remaining pleurae .05 mm. Glans penis 

 armed with very minute hooks. 



Taken in tide-pools at extreme low water near Point Pinos, the southern 

 most point of Monterey Bay ; rare. 



Species named in recognition of the able work of my friend Capt. Chas. 

 B. Hudson, Artist of the U. S. Bureau of Fisheries. 



18. Acanthodoris brunnea sp. nov. 



Type from Monterey Bay, Calif. No. 181,293, U. S. National Museum. 



Body outline oval, convex, broadest in front in region of rhinophores ; 

 mantle thickly set everywhere with blunt conical tubercles, its mantle 

 broad and thick. 



General color of dorsum brown, flecked with irregular blotches of black ; 

 between the tubercles numerous small spots of light lemon-yellow, the 

 mantle edged with same color; tips of branchiae lemon-yellow; rhino 

 phores deep, blue-black, tipped -with yellowish white ; ventral surface 

 yellow sprinkled with fine black dots. 



Total length, 19 to 22 mm., .width, 9 to 15 mm. ; height, 7 to 9 mm. 



Head broad, continued laterally into the wide flat oral tentacles; foot 

 oval, nearly quadrangular, both ends bluntly rounded ; rhinophores long, 

 cylindro-conical inclined outward and forward, per foliate with 20 to 

 28 leaves, the lower ones in front only, retractile into low sheaths with 

 lobed margins ; branchiae 7, wide-spreading, bipinnate, without sheath ; 

 pharyngeal crop large, spherical, constricted longitudinally into 2 sym 

 metrical sides ; labial armature an incomplete band of mosaic-like hooks 

 incomplete above ; at the lower margin of the armature a single flattened 

 slightly concave longitudinal plate, its margin blunt and freely projecting 

 in front, extending across the whole labial armature ; radula narrow, the 

 teeth in 24 to 28 rows, light yellow ; rhachis very narrow, naked ; first 

 pleural tooth similar in form to that of the preceding species but decidedly 

 smaller being but .342 mm. in total length ; upon its upper posterior border 

 a squarish thickened shoulder directed obliquely upward ; inner border of 

 the hook with a series of 14 to 19 denticles ; remaining 6 or 7 pleurae small, 

 obliquely placed and decreasing regularly in size from within outward ; 

 the first ones of these outer plates bear a flattened thickened dorsal border 

 with a thin keel-like expansion below, the outer ones reduced to mere 

 flattened plates. Glans penis armed with minute hooks. 



Dredged off hard sandy bottom in about 10 to 20 metres depth near 

 Monterey ; rather rare. 



